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FiringSquad.com hardware review
http://www.firingsquad.com/hardware/pmp300/
formen.ign.com: GearHeadsUp: Diamond Rio 600 revie
http://formen.ign.com/news/19858.html
A quick look at Diamond's most recent MP3 player, due out June or July of 2000
Sharky Extreme review
http://www.sharkyextreme.com/hardware/diamond_rio/
Wearablegear.com review
http://www.wearablegear.com/reviews/riorev.htm